OnDraw, how can I get the rectangle that is painting ?

[Lost User]

Hi, OnDraw..., draws all the screen ?, or with InvalidateRect(...), draws only a portion of the screen ?, I call ScrollWindow ( in a scroll view), how can I get in the on Draw method the rectangle of the screen that will be new drawn ( not moved) ? Thanks, Bye ! Braulio

[Henk Devos]

You receive this rectangle when you call BeginPaint in your WM_PAINT message handler. The classwizard adds this function for you. Note that your OnDraw will also be called for printing. ================== The original message was: Hi,

OnDraw..., draws all the screen ?, or with InvalidateRect(...), draws only a portion of the screen ?, I call ScrollWindow ( in a scroll view), how can I get in the on Draw method the rectangle of the screen that will be new drawn ( not moved) ?

Thanks, Bye !
Braulio

[Lost User]

Use CDC::GetClipBox to get the area that needs to be repainted.